Possessive pronoun "свой"

There are many interesting constructions that characterize belonging in Russian grammar,
So, the pronouns свой/своя́/своё/свои́  also indicate the belonging of the subject.

Instrumental case in the passive

There can be two constructions in Russian
- active (the subject does the action and is actively directed to the object),
- passive (an action is performed on the subject)

Verbs with the postfix -СЯ

In the Russian language there are many verbs with a particle -СЯ at the end. This particle is called a reflexive postfix, and verbs with this postfix are called "reflexive verbs".
All reflexive verbs are intransitive, that means that after them the Accusative case is not used without.

January 27 - the day of lifting the siege of Leningrad

Prepositions of reason

Prepositions are words that connect words in phrases and sentences.
There are many prepositions in the Russian language. They do not change, but the word after the prepositions change in cases.
Prepositions can have meanings of place, time, purpose, reason, and others.